单项选择题
What is the functionality of L2TP in a BRAS environment?（）
A.It tunnels DHCP requests to the LNS. B.It provides access for analog modem users. C.It provides RFC 2547 VPN services to the user. D.It tunnels a PPP session across an IP backbone.
单项选择题 Which CLI command displays the active L2TP sessions on an LAC?（）
单项选择题 Which sequence of messages demonstrates the communications between the LAC and LNS when theyestablish an L2TP session?（）
单项选择题 Which statement describes the function of the LNS in a L2TP environment?（）
